tesla loudspeakers

[Tuukka]

i acquired a pair of old speakers from a friend of mine. i tried researching these speakers but could not find anything about them. hopefully someone here might know.

brand and model number are Tesla ARO-666. it's an 8" speaker with a blue frame and a black plastic cover over the magnet. very vintage: thin paper cone, accordion surround, no real dust cap, instead there is a small mesh. apparently they came out of an old record player.

i built a roughly 25liter sealed enclosure for them and they sound very detailed and full as they are just running fullrange with no eq or xo. impressive for a pair of speakers that sat hanging off a shelf, in a free-air baffle, in a dusty garage on a farm for at least a decade, with the sun constantly beating on their back through the window.

anyway, just wanted to see if anyone on the forum has heard of these drivers or even the brand.

[deiksac]

this is an obsolete model made by tesla (now tvm acoustics - www.tvm.cz) in 70s, i was trying to find something nore specific about it but their data is not very accurate

[deiksac]

could be some 5 watt, sensitivity somewhere near 86-87 dB
its successor was ARN (i think, am not sure) 6604(8) with some twenty watts, better magent but more or less same cone

[deiksac]

if you would like me to find something more specific about them, please ask

[Bose(o)]

I remembered this thread a while ago and after cracking open a pair of Toshibas that my friend had given me, I just had to post. I have the exact same speakers that you are using right now. I'm going to measure their T/S specs in about 30 minutes or so. If you want efficiency and such numbers, tell me how to measure them and I will.

[phase_accurate]

If you want efficiency and such numbers, tell me how to measure them and I will.

You can CALCULATE efficiency from the TSPs.


Regards

Charles

[Bose(o)]

oh yeah...that's right! My bad.

[Bose(o)]

Tesla ARO 666 T/S parameters:
Qts:0.81
Vas:17.3L
Fs:93Hz.
Re:7.7ohm
Le: ?
Xmax: ?
Qms: 4.79
Qes: 0.98
Pe: 5W (as per back of magnet)
Sd: 268.66cm^2
SPL: 74dB.@1W, 1m. (seems a little low.)

[planet10]

Originally posted by Bose(o)
SPL: 74dB.@1W, 1m. (seems a little low.)

It certainly does... i've had a number of these, and they were all closer to the 86-87 dB figure mentioned earlier.

dave

[Bose(o)]

Planet10,

Where did you enlist your Tesla speakers for use? I was thinking of using the C-channel on my Sansui for the other sections of the basement and also making use of Open Baffles.